20. Number Sense Shane took a test that had a total of 21 items. He got about fay the items correct. About how many itemy did he get correct?

Shane's test had a total of 21 items. If he got about half correct, we can estimate that he correctly answered around 10 to 11 items. Rounding down to 10 is often easier when estimating, but since we're looking for "about" half, we'll say he likely scored around 10 or 11 of those items. When estimating fractions, particularly halves, it's handy to remember that simple division or basic mental math can get you there! Just think of splitting the total number in half—if it's an odd number like 21, know that your answer will be close to the midpoint!